refactor(vd960Loop): 算法回退到 DLD154V4B，四通道适配

- 用 DLD154V4B vd1_task/per_channel 替换 vds_task 复杂算法
- 移除 FUNCTION_B/二次判断/快速变化/多重确认等增强特性
- 保留平坦性离开算法 (CN200910309382)，每通道独立状态
- 灵敏度表改为 DLD154V4B 4级: {216,108,36,10} / {108,72,18,9}
- 清理废弃类型: FltHistoryManager, Loop_ACS_Info, StageRangeConfig 等
- 首次添加 vd960DBN 完整源码

vd960Loop/utilities/at32f421_freertos_demo/src/at32f421_int.c

@@ -0,0 +1,142 @@
+/**
+  **************************************************************************
+  * @file     at32f421_int.c
+  * @brief    main interrupt service routines.
+  **************************************************************************
+  *                       Copyright notice & Disclaimer
+  *
+  * The software Board Support Package (BSP) that is made available to
+  * download from Artery official website is the copyrighted work of Artery.
+  * Artery authorizes customers to use, copy, and distribute the BSP
+  * software and its related documentation for the purpose of design and
+  * development in conjunction with Artery microcontrollers. Use of the
+  * software is governed by this copyright notice and the following disclaimer.
+  *
+  * THIS SOFTWARE IS PROVIDED ON "AS IS" BASIS WITHOUT WARRANTIES,
+  * GUARANTEES OR REPRESENTATIONS OF ANY KIND. ARTERY EXPRESSLY DISCLAIMS,
+  * TO THE FULLEST EXTENT PERMITTED BY LAW, ALL EXPRESS, IMPLIED OR
+  * STATUTORY OR OTHER WARRANTIES, GUARANTEES OR REPRESENTATIONS,
+  * INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
+  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
+  *
+  **************************************************************************
+  */
+
+/* includes ------------------------------------------------------------------*/
+#include "at32f421_int.h"
+
+
+
+/** @addtogroup FreeRTOS_demo
+  * @{
+  */
+
+
+
+/**
+  * @brief  this function handles nmi exception.
+  * @param  none
+  * @retval none
+  */
+void NMI_Handler(void)
+{
+}
+
+/**
+  * @brief  this function handles hard fault exception.
+  * @param  none
+  * @retval none
+  */
+void HardFault_Handler(void)
+{
+  /* go to infinite loop when hard fault exception occurs */
+  while(1)
+  {
+  }
+}
+
+/**
+  * @brief  this function handles memory manage exception.
+  * @param  none
+  * @retval none
+  */
+void MemManage_Handler(void)
+{
+  /* go to infinite loop when memory manage exception occurs */
+  while(1)
+  {
+  }
+}
+
+/**
+  * @brief  this function handles bus fault exception.
+  * @param  none
+  * @retval none
+  */
+void BusFault_Handler(void)
+{
+  /* go to infinite loop when bus fault exception occurs */
+  while(1)
+  {
+  }
+}
+
+/**
+  * @brief  this function handles usage fault exception.
+  * @param  none
+  * @retval none
+  */
+void UsageFault_Handler(void)
+{
+  /* go to infinite loop when usage fault exception occurs */
+  while(1)
+  {
+  }
+}
+
+/**
+  * @brief  this function handles svcall exception.
+  * @param  none
+  * @retval none
+  */
+//void SVC_Handler(void)
+//{
+//}
+
+/**
+  * @brief  this function handles debug monitor exception.
+  * @param  none
+  * @retval none
+  */
+void DebugMon_Handler(void)
+{
+}
+
+
+
+
+/**
+  * @brief  this function handles pendsv_handler exception.
+  * @param  none
+  * @retval none
+  */
+//void PendSV_Handler(void)
+//{
+//}
+
+/**
+  * @brief  this function handles systick handler.
+  * @param  none
+  * @retval none
+  */
+//void SysTick_Handler(void)
+//{
+//}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */